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Journal of Coastal and Ocean Sciences
Published by Universitas Riau
ISSN : 27454355     EISSN : 27464512     DOI : -
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science Immunology & microbiology Physics
Journal of Coastal and Ocean Sciences is a journal publishes scientific articles from research by lecturers and other researchers in the marine sector. Covers aspects of biology, physics and chemistry, both for brackish waters (mangrove swamps, river estuaries) and marine waters (coastal and offshore seas).
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Perairan
Articles 20 Documents
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Search results for , issue "Vol. 6 No. 1 (2025): January" : 20 Documents clear
Relationship Between Tree Diameter and Mangrove Vegetation Carbon Stock in Apar Village, Pariaman City, West Sumatra Gusfi, Melly; Efriyeldi, Efriyeldi; Mulyadi, Aras
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.1.16-22

Abstract

This research was conducted in January 2024 in the Mangrove Area of ​​Apar Village, Pariaman City, West Sumatra Province. This research aims to determine mangroves' density and carbon stock conditions and the relationship between the diameter of mangrove trees of the Rhizophora mucronata, Sonneratia caseolaris, and S.alba types with mangrove carbon stock. The method used in this research is a survey method with direct observation and data collection at the research location. Non-destructive sampling measured the diameter of mangrove trees' breast height in each plot. The average density of mangrove stands at the three research stations was 1,222.22 tons/ha, the average amount of mangrove biomass was 688.49 tons/ha, the average amount of mangrove carbon stock was 323.59 tonnes/ha, and the average mangrove CO₂ uptake is 1,186.51 tons/ha
Nematocytes in the Coral Species Acropora formosa on Kasiak Island, Pariaman City, West Sumatera Pratama, Bima; Thamrin, Thamrin; Nursyirwani, Nursyirwani
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.1.39-43

Abstract

This research was conducted in January 2024 on Kasiak Island, Pariaman City, West Sumatra Province. This research aims to identify nematocytes found in the body tissue of the Acropora formosa coral. The method used in this research is a survey method with direct observation and sampling in the field. Determination of the type of nematocytes from A. formosa coral was carried out using an Olympus microscope with an objective lens magnification of 10X40 (400) at the Marine Biology Laboratory, Faculty of Fisheries and Marine, Universitas Riau. Of the 25 main types of nematocytes known in the phylum Cnidaria, one type was found in this species. The results of the research show that there is a type of Holotrichous isohiza in the A. formosa coral. This type of nematocyte is thought to be used to attack and kill prey
Assessing the Contribution of Marine Fisheries to the Indonesian Economy Mardhani, Martahadi; Syardiansah, Syardiansah; Amilia, Suri; Aswadi, Khairul
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.1.1-4

Abstract

Marine fisheries significantly contribute to the economy of many regions and countries. This study aims to analyze the contribution of marine fisheries to economic growth in Indonesia. Johansen cointegration (JC) test and Fully Modified Ordinary Least Squares (FMOLS) are applied to investigate the contribution of the marine fisheries sector to economic growth. This study uses time series data from Statistics Indonesia (BPS) and the Ministry of Maritime Affairs and Fisheries (KKP) from 2010 to 2022. The findings indicated a long-term equilibrium among the measured variables. Marine fisheries have a significant and contributing effect on long-term economic development. The data demonstrate that the fisheries sector has become a source of food, job creation, and welfare for fishermen
Analysis of Chlorophyll-a Distribution in Determining the Fishing District of (Euthynnus affinis) Using Satellite Images in North Sumatera Sea Flows Arta, Fandi; Afriani, Afni; Karisma, Rizki
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.1.5-9

Abstract

The North Sumatra Sea waters are one of the potential areas for tuna (Euthynnus affinis) fisheries. However, fishermen's determination of fishing grounds still relies on traditional methods, such as observing seabirds and water color changes, which are often inaccurate. This study aims to determine chlorophyll-A distribution, the accuracy of tuna fishing areas, and the relationship between chlorophyll-A and catch using satellite imagery. This research is beneficial because it is helpful reference material for the fishing industry and the community regarding the relationship between chlorophyll-a and fishing grounds. This research was conducted from April 05 to April 29, 2024, using Aqua Modis satellite image data. The research method used was a survey method that was analyzed descriptively. The results obtained during the study showed that the highest chlorophyll-a concentration occurred in the period April 22 to April 29, 2024, with an average value of 8.71 mg/m3, and the lowest occurred in the period April 06 to April 13, 2024, with an average value of 4.83 mg/m3. Determination of the estimated fishing grounds for tuna (Euthynnus affinis) with overlay technique by shading the chlorophyll-a criteria area >0.1 mg/m3. The accuracy level of the estimation of tuna fishing grounds has an average accuracy of 52%. Chlorophyll-a and catches in North Sumatra Sea Waters have a very strong relationship with an R-value of 0.99
Estimation of Carbon Stock of Sediment in Mangrove Ecosystem of Apar Village, North Pariaman Sub-District, West Sumatra Saputra, Muhammad Nasrul; Nedi, Syahril; Siregar, Yusni Ikhwan
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.1.30-38

Abstract

Global warming is one of the issues in the world today, characterized by an increase in the earth's temperature due to greenhouse gases. Mangrove forests are one of the blue carbon parameters that can utilize CO2 for photosynthesis and store it in the form of biomass and sediment well. Sediments serve as a growing medium and a place to accumulate various components, including carbon. Carbon stored in mangrove sediments tends to be greater than in other types of forests. The study aimed to determine sediment carbon stocks based on density and the relationship between mangrove density and estimated carbon stocks in sediments in the mangrove ecosystem of Apar Village, North Pariaman District. Mangrove sediment sampling was carried out using the Purpose Sampling technique, and the data obtained were analyzed using the Loss on Ignition method. The results showed that the highest average carbon stock in sediments was found at station 2 with medium density, which was 215,03 tonnes/ha, followed by station 3, which had a high density, with a value of 197,98 tonnes/ha, and the lowest average carbon stock was found at station 1 with medium density, which was 132,43 ind/ha. Future research is expected to observe carbon stocks in mangrove stands and litter in the Apar Village mangrove ecosystem to obtain more detailed information.
Abundance and Diversity of Mushroom Coral of the Fungiidae in the Waters of Pasumpahan Island, West Sumatra Pratama, Farrel; Thamrin, Thamrin; Nurrachmi, Irvina
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.1.23-29

Abstract

Mushroom coral (Fungiidae) is one of the families of hard corals (scleractinian) that live off the substrate (free-living), and most of the mushroom coral habitat is found on the reef slope, which has a substrate of broken coral. This study aimed to analyze the abundance and diversity and determine the differences in abundance of mushroom corals at different depths. This research was conducted in March 2024 in Pasumpahan Island, West Sumatra. This study used the survey method and belt transect method. The sampling location was divided into three stations consisting of 3 sampling points. Station I is located in the tourist area, Station II is in the dock area, and Station III is in the area facing the open sea. The results showed that the highest abundance based on depth was found at station III with a depth of 7 m, namely 4357.14 ind/Ha and the lowest abundance at station II with a depth of 5 m, namely 1285.71 ind/Ha. The t-test results obtained a significant value of less than 0.05, namely 0.048, which means that the abundance of mushroom corals at different depths is significantly different. The diversity index ranges from 1.930 to 2.013, which shows that the level of diversity of mushroom corals in the waters of Pasumpahan Island is classified as moderate
Distribution of Sea Surface Temperature and Salinity in the Karimata Strait Yuliardi, Amir Yarkhasy; Firdaus, Randi; Heltria, Septy; Prayogo, Luhur Moekti; Nugroho, Agung Tri; Rahmalia, Diah Ayu; Sari, Ratna Juita
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.1.10-15

Abstract

The Karimata Strait possesses unique characteristics influenced by its geographical location and the local, regional, and global impacts on its physical, biological, and chemical parameters, contributing to its potential as a significant fishing ground. This study aims to observe and analyze the physical oceanographic parameters, including temperature, salinity, and sea surface currents, within the Karimata Strait. The dataset comprises monthly averaged data, resulting in a single representative value for each month. Key physical parameters examined include temperature, salinity, and the horizontal (u) and vertical (v) current components. The patterns of sea surface temperature (SST) and salinity distribution in the Karimata Strait exhibit significant variations between the west and east monsoons. During the west monsoon season, the South China Sea influenced the region with lower SST and higher salinity than the Java Sea. In contrast, the east monsoon demonstrates an inverse pattern with warmer, fresher waters from the Java Sea moving towards the strait. Additionally, the horizontal distribution of these parameters highlights the critical role of sea currents in dispersing physical oceanographic characteristics within the region. These findings underscore the dynamic nature of the Karimata Strait's oceanography, influenced by seasonal monsoon shifts, water masses from adjacent seas, and freshwater inputs from rivers, crucial for understanding the broader Indonesian Throughflow (ITF) system and its implications for regional climate and marine ecosystems.
Fermentation of Livestock Blood Waste as Fish Feed Ingredient Andriani, Yuli; Dipatiguna, Siti Nisrina Ulfah; Putra, Vito Dwisetia; Prasadi, Marsel; Aisyah, Aisyah
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.1.44-50

Abstract

Livestock blood waste has significant potential to be utilized as an alternative feed ingredient due to its high protein content, reaching up to 80%, and abundant availability. However, blood waste is known to contain high levels of iron and an imbalanced amino acid profile. Based on these issues, one potential solution is to ferment livestock blood waste to enhance its nutritional value. This review article aims to compile and analyze various effective fermentation methods and identify best practices in the fermentation process of livestock blood waste. Fermentation can be carried out using various microbes, mainly lactic acid bacteria. Fermentation treatment of livestock blood waste with lactic acid bacteria using lactic acid concentrations ranging from 3% to 6% produces blood waste with a well-balanced nutritional profile. Meanwhile, the optimal use of blood waste as an alternative feed ingredient for fish is achieved by adding formic and propionic acids at doses of 1.5%–3%, improving fish protein digestibility by 94.66%. This indicates that livestock blood waste can be an alternative raw material in fish feed production
Effects of Fermentation on the Physico-Chemical Properties of Marine By-Products: A Review Shobihah, Hasna Nabila; Andriani, Yuli; Wiyatna, Muhamad Fatah; Iskandar, Iskandar; Zidni, Irfan; Rustama, Mia Miranti
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.1.51-58

Abstract

Marine by-products hold significant potential to be utilized as raw materials with added value, particularly in producing high-quality and environmentally friendly fish feed. This study aims to review the impact of fermentation on the physical and chemical properties of marine by-products. The method employed is a narrative literature review, referencing scientific literature from databases such as ScienceDirect and Google Scholar. The literature analysis highlights changes in physical structure, such as alterations in color and odor, that contribute to improved feed digestibility. In addition, fermentation also increases nutrient content, including proteins and essential amino acids, and produces bioactive compounds that act as antimicrobials and antioxidants. This study identifies that fermentation reduces waste and enhances its economic value for various applications, such as fish feed and alternative raw materials. Thus, this review provides innovative solutions for marine by-product management while supporting sustainability and efficiency principles in the fisheries industry
Stock Assessment and Sustainable Potential of Skipjack Tuna (Katsuwonus pelamis) in Sibolga Waters for Optimized Fishing Practices Limbong, Irwan; Brown, Arthur; Isnaniah, Isnaniah; Kholis, Muhammad Natsir
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.1.59-64

Abstract

The uncontrolled fishing of skipjack tuna (Katsuwonus pelamis) without recruitment efforts has led to stock degradation and unstable abundance due to excessive pressure. This study aims to estimate the sustainable potential of skipjack tuna by calculating Catch per Unit Effort (CPUE), assessing Maximum Sustainable Yield (MSY), and determining Total Allowable Catch (TAC). The research was conducted at PPN Sibolga and utilized survey-based data collection and surplus production analysis using the Schaefer model. The findings indicate that standardized CPUE in 2018 was 0.639 tons/trip, increased to 0.764 tons/trip in 2019, dropped to 0.527 tons/trip in 2020 and 0.506 tons/trip in 2021, and returned to 0.639 tons/trip in 2022. Purse seines were identified as the primary fishing gear. The Schaefer model estimated CMSY at 8,699.7 tons, classifying the fishery as fully exploited. FMSY was calculated at 5,447 trips, with annual efforts consistently exceeding this threshold, indicating overfishing. The TAC was set at 6,959.7 tons. Management strategies should regulate fishing efforts, enforce gear specifications, and implement science-based fisheries policies to prevent further degradation. Aligning fishing activities with sustainable thresholds will support skipjack tuna stocks' recovery and long-term productivity. These findings underline the importance of adaptive management and collaboration to sustain marine ecosystems and protect livelihoods

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